JPH01245611A - Commutation grid composition for signal distribution - Google Patents

Abstract

PURPOSE: To simplify a structure by making a processing card be parallel to a commutation card and bringing it into contact with an output card through edges of both cards. CONSTITUTION: Each output of each input card 1 (1a to 1n) is connected to an input of one commutation card in a subassembly of commutation cards 3 (3a to 3n) in supporting racks 2 of a grid structure. The commutation card 3 is connected to a subassembly that consists of output cards 5 (5a to 5m), and the output cards 5 are arranged in the racks 2 in such a manner that their planes are perpendicular to the planes of the commutation cards 3. Between the card 5 and a processing card 20, a contacting point 19 is formed by a point contact that is made between edges of both cards 5 and 20 which are perpendicular to each other like a contacting point 10 between the cards 3 and 5. Thereby, the structure is simple and inexpensive and also has reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to commutation grid configurations. This crit configuration distributes a signal, specifically a video signal, selected from N signals applied to a number of inputs to M outputs, with each of the M outputs being connected to an appropriate remote control signal. It is possible to arbitrarily switch the connection to one of the N inputs as a function.

Recently, video signal distribution systems (networks) using cables and optical fibers, such as those described in European Patent Publication No. 0] 18161 and French Patent Publication No. 2,285,758, have developed considerably. According to this, it is possible to supply images of programs simultaneously transmitted through this network or images of a large number of programs from pre-registered transmission programs to a specific group of users. These images are received according to the user's selections, and the user can select the images he or she wishes to receive on his or her own receiving device, such as a television receiver, cheap coater, monitor, etc. The distribution of such images may include charging fees for certain programs, controlling reception periods for automatic billing or billing, initiating transmissions, or using a central In some cases, it may be necessary to control and/or check the transmission of images in order to stop the transmission of programs from the control unit of the controller. Furthermore, if there is a system that can partially interact with each other so that users can have a certain degree of conversation, for example, for public opinion polls using television receivers, audience rating surveys, or buying and selling of goods, etc. It's convenient.

A distribution network with a commutation grid configuration of the type described above is particularly useful in the field of collective facilities, e.g. complexes of buildings, hotels, hospitals, etc., in which each user can manage a wide variety of programmes. You can receive images selected from among them, and not only images,
It can also receive aural and stereo audio, audio from other signal sources, and audio from purely audio signal sources (particularly broadcast numbers).

In particular, according to European Patent Application No. 0152]73, it has been considered to construct a commutation grid ia in the form of a matrix consisting of interconnected lines and columns, according to which N inputs of the matrix can be optionally connected to M outputs to transmit arbitrarily selected and predetermined signals to the user.

However, currently used devices are generally very complex, expensive, and fairly complicated to use. In particular, it is difficult to install the equipment in a condition that allows it to exhibit its best efficiency.

Furthermore, in the commutation system described in the above-mentioned European patent application, the commutation card used can only receive one input signal, which is a high frequency signal.

Meanwhile, PCT Application No. PCT/FR'88/00
No. 046 specifically states that signals such as video images supplied from any signal source (television receiver, cheap recorder, camera, satellite receiver, or computer monitor, etc.) can be processed without deterioration in quality. , a simple and reliable method and apparatus for transmitting to a receiver located at a remote location is presented, the transmission to the receiver being possible over two wires of very small cross-section, in particular less than 1+*m. 2, which are formed and therefore highly discrete, flexible, and easy to install and hide from view without the need for installation operations, such as with coaxial cables. It is done through a wire lead. Using this method,
Any method (FAI, method, SEC
AM system, D2 MACPAQUET system, etc.), video signals of any format can be sent to a suitable receiving device. This system then controls the signal source (on, off,
In some cases, the user can remotely control the review motion, stay, recording, audio, brightness or contrast level settings from the receiving device, and in order to transmit the remote control signals necessary for this remote control, It is designed to be sent in the opposite direction using the same two-wire leit that carries the video signal.

It is an object of the present invention to provide a commutation grid configuration which satisfies the requirements mentioned above, and in particular to transmit video signals selected from a group of different signals coming from a common network to a predetermined number of output lines. This configuration is simple, inexpensive, and provides a commutation grid configuration by implementing the method described above for transmitting a transmitted signal so that it can be transmitted to any output line chosen from It is reliable and can be commutated on demand and according to the wishes of the user.

<Summary of the Invention> The commutation grid according to the present invention is designed to prevent crosstalk between video signals flowing through the connections of the grid configuration, and the video signals are
Transmitted without distortion or attenuation in the frequency band ranging from z to 30 Mt (z and above).The grid configuration has a compact and modular structure and should be sent to M outputs assigned to the users. There is no limit to the number N of inputs receiving signals, and the user may receive any of the above signals.

According to the invention, the commutation-crid arrangement has a fixed support structure for an input card arrangement for receiving each signal, in particular a video signal, and possibly a video and/or audio signal, and for the input card arrangement receiving The number of signals transmitted is a predetermined divisor of the total number N signals to be transmitted. This grid configuration consists of at least one subassembly of commutation cards, each connected to one input card, and all connected to an assembly of commutation cards, from a corresponding input card. each commutation card includes at least one subassembly consisting of an output card for transmitting to the user selected any of the signals received by the commutation card; It has an assembly of parallel input cassels equal to a divisor defining the number of video signals and an assembly of output cells equal to the number of output cards, each input cell and each output cell being in communication with each other. A selected signal is passed from the input to the output under instructions sent by the user through the output card corresponding to the user via a processing card common to the assembly of commutation cards and interconnected by communication cells. It has become so. The processing card controls the conversion stages of the received order. The support structure includes at least one rack housing a parallel commutation card subassembly and an output card subassembly that is also arranged parallel or perpendicular to the commutation card, and the support structure includes A contact point between an edge or ridge and a corresponding edge of a corresponding output card provides a connection between an output cell on a commutation card and a selection circuit on an output card associated with the commutation card.

According to one feature of the invention, the processing card is parallel to the commutation card and is in edge contact with the output card.

Preferably, the output of the selection circuit is a transmitter circuit that recovers the audio and video signals onto their respective separate conductors before transmitting them to a two-wire lead that transmits these signals to a suitable receiver at a remote location. It is connected to the. In particular, the commutation grid configuration of the present invention uses the configuration of the aforementioned PCT Application No. PCT/FR88100046 with respect to the transmitter, receiver, and two-wire REIT connecting them.

Further, according to another feature of the invention, each commutation card in the subassembly is coupled to the output of the input card by an adaptive coaxial cable, each of the cables corresponding to the signals received at the input card. The application of the cable to each of the commutation cards of the subassembly is carried out at each end by an input card and a terminal resistor.

Other features of the commutation grid structure of the present invention will become clear from the description of the embodiments with reference to the following drawings. However, this invention is not limited to the described embodiments.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
~ shows an outline of the relative positional relationship when attached to the commutation card, output card, and processing card. These form part of the commutation grid configuration of this invention.

The system comprises an assembly of cards, for example called input cards 1, 1a, . . . , for the video signal V and the audio signal A.

Video signal (1) and audio signal (A) are supplied to the inputs of card 1 from an assembly of coaxial cables or conventional optical fibers (not shown). If necessary, these signals are preprocessed in suitable demodulation and modification stages (not shown or known), so that the video and audio signals are provided at baseband.

The signals thus supplied to the input card therefore form an assembly of n signals. These n signals are then distributed into separate groups, each of which is a predetermined divisor of N, and thus each signal group is assigned to each input card 1.1a, . . . 1n. These signals may be independent C or, for boat fishing, may be exploited at least 2×2. In particular, the signal can be expanded during the transmission of television images, where the video signal must be accompanied by a corresponding audio signal. Additionally, two audio signals may be attached to the same video signal for stereo audio transmission. On the other hand, it is also possible to use only audio signals, whether the input signal is stereo or stereo. This grid configuration is capable of transmitting any type of signal, video signal, audio signal, or other type of signal to the user. The specific nature of the signal will vary depending on the particular application of the invention. However, in this case, these signals may be processed in advance in order to fall within an appropriate frequency band ranging from several tens of Hz to 30 MIIz or more.

Each of the outputs of each input card 1 (], a, ... In) is connected to one of the subassemblies of commutation cards 3 (3a, ... 3n) in a support rack 2 in a lid configuration. Connected to the commutation card input.

These cards 3 (3a, . . . 3n) are stacked one on top of the other. For the input cards 1, . . . and the commutation cards 3, .

In order to identify a particular commutation grid configuration, each of the signals received from the network at the input is a single audio signal, a video signal with one audio signal, and a video signal with two audio signals, as described above. Consider a case where N=48 video signals are handled. The input cards 1.1a, . . . 1n each handle eight signals of the type previously described. That is, the divisor n
is 6 in this example. That is, 6 input cards l
are used, and six commutation cards 3 are used for each subassembly. In FIG. 1, only card l among the input cards is shown by a solid line, and card la
, . . . In is indicated by a dashed line.

For each signal to be transmitted, any one of the input cards 1 and the commutation cards 3.3a, . . .
3n is made using a coaxial cable 4, which couples the handled signals to an input stage E provided on the corresponding card 3. The details will be described later.

Each cable 4 is impedance matched at both ends.

The commutation card 3 includes output cards 5.5a, ・
...is combined into a subassembly consisting of 5II. This output card 5 receives any one of the signals handled in the grid configuration and transmits it to a small cross-section two-wire lead 6.
to a suitable receiver (not shown). Signal transmission and reception are carried out on the input and output sides of lead 6.
Preferably, this is done by methods such as those described in the aforementioned PCT applications. Preferably, the elements mounted on each commutation card are arranged in an area extending from the corresponding output card.

The subassembly composed of the output cards 5.5a, . . . 5m corresponding to the commutation cards 3 in each element of the rack 2 corresponds to a divisor of the total number of users M in this grid configuration, , each of these output cards 5 independently selects any one of the input signals received by the grid configuration on its assigned two-wire lead 6 and also uses the same lead 6 to remotely Control commands can be sent in the opposite direction to cause the desired switching connections to be made, ie the necessary connections between the input receiving the selected signal and the output line corresponding to the user providing the command.

In the example illustrated above, the number of output cards 5 is chosen to be equal to the number of meters corresponding to the output card 5, which means that 20 output cards 5.5a, . . . 5m are provided in the rack 2. It means that.

However, the commutation grid configuration of this invention is
Of course, it should be understood that the invention is not limited to using 20 output cards, and could also be applied to the use of more cards. However, if you use more cards, you can use 6 cards as shown in Figure 1.
3 commutation cards and 5 output cards of 20
A second rack 2 similarly contains six commutation cards 3', 3a', =3m' and 20 output cards 5', 5a', . . . 5 Oboro'. ',... will be added. For example, 48
In order to send input signals from 60 output lines to 60 users, three racks 2.2', 2 each having 20 output cards 5 and 6 commutation cards 3 are required.
- is used (Figure 2). The rack assembly thus formed is provided with six input cards l. Each input card handles eight signals, which are sent by coaxial cable 4 to each rack in the rack assembly in turn. In this case, as schematically shown in FIG. 1 and more clearly shown in FIG. , an extension line 4' connecting each commutation card in parallel from one rack to the next;
The coaxial cable 4 and its extension lines 4', 4'' are impedance matched at each end by a corresponding card 1 on one side and a suitable terminal resistor 7 on the other side.

FIG. 3 shows that any input on one input card 1, for example a video signal 2 accompanied by an audio signal A, is coupled through the commutation card 3 to the output card 5 and from the output card 5 to the transmission line 6. Indicates the condition.

In the card 1, the audio signal A is modulated in advance in the circuit 8, while the video signal V superimposed on the audio signal A and sent to the card 1 at baseband is extracted as is. These signals are fed to a summing circuit 9 and then to a matching circuit 9a and from there via a cable 4 to any one of the cards 3. Signal A
and V are connected to rack 2 by cables 4 and 4', 4''.
Or commutation car 1 in rack 2', 2''
It is sent in parallel to ~3 assembly units. At the output of commutation card 3, the signal is
Due to the features of the crit construction according to the invention, this card 5 is placed in the rack 2 (as shown in FIG. 2', 2''). This special arrangement of the cards 3 and 5 allows the six cards 3 in this example to be arranged parallel to each other in each of the corresponding sub-assemblies. This saves considerable space in the rack by directly engaging two cards 5, and limits the contact points on each card to only the edge contact points, allowing the connection of one card to the other. You can obtain the necessary electrical connections for signal flow to your computer.

In FIG. 3, the contact point 1o between cards 3 and 5 is shown as a type of conductor for convenience of explanation, but in reality, as shown in FIG. 1, it is a direct point contact between cards 3 and 5. be. Preferably, as also shown in FIG. 1, each commutation card 3 has a circuit arrangement 11 formed on one side thereof, on which various circuit elements and connecting straps 12 are formed.
is formed. On the other hand, the output conductor 13 and its corresponding connection are provided by printed circuit traces extending on the opposite side of the card, preferably in a direction perpendicular to the strap 12. Using this configuration, crosstalk for signals simultaneously received by the card 3 is greatly reduced, while providing shielding between the input and output, and also reducing ground current effects. In the card 5, the received signal passes through a selection circuit 14, which will be described later, and a transmission stage 15 which reproduces the audio signal A and the video signal ■ onto conductors 16 and 17, respectively.
and finally to the two-wire lead 6 at the output of the card.

According to one feature of the invention, the transmission circuit 15 is constructed using the configuration shown in FIGS. 2 and 3 of the aforementioned PCT Application No. PCT/F R88100046, although other configurations may be used as the case may be. The transmission configurations described with reference can be used. Such a circuit as disclosed in this PCT application is used in the present invention to transmit signals, particularly video signals, to a two-wire REIT. This transmission is voltage controlled depending on the signal to be transmitted, and at least one
This is done by powering the leads using two current generators. The leads are matched at each end with an impedance equal to their characteristic impedance. More specifically, as shown in the said PCT application, the circuit 15 has two current generators connected in series with two equal resistors, the intermediate connection point of which is grounded via a capacitor. The incoming signal is supplied to the REET through the windings of a symmetrical transformer installed in series with each wire of the lead 6.

Through this same two-wire lead 6 in the opposite direction, the remote control information necessary for the operation of the grid arrangement is transmitted, also according to further characteristics of the device as described in the above-mentioned PCT application. This information is in the form of pulses output by the output card 5 or the assigned user, which pulses are sent back to the processing circuit 18 in the opposite direction to the received signal. Processing circuit 18 provides appropriate pulses at output 19. This pulse is applied to the input of a card 20 called the processing card.

The processing card 20 is accommodated in the rack 2 in a different manner from the commutation card 3, preferably parallel to the card 3.

As shown in FIG. 1, there are two mutually perpendicular edges between the output card 5 and the processing card 20, as well as a contact point lO between the commutation card 3 and the output card 5. A contact point 19 is formed by the point contact between. This contact point 19 is shown in the form of a conductor in FIG. 3 for purposes of clarity. The processing circuit 18 includes the above-mentioned P
Preferably, the configuration described in the CT application is followed, and in particular includes a differential stage, a bandpass filter, a demodulator and, if necessary, an integrated amplifier in this demodulator, and the remote control signal thus processed is and/or inserted in the lead 6 in parallel with a receiving device for audio signals, and is received by a two-wire lead 6 from a suitable signal source (for example an infrared generator) which controls a current generator with symmetrical operation.

Finally, in FIG. 3, a processing card 20 is shown schematically. This card 20 includes, inter alia, circuitry in the form of a microprocessor that decodes remote control information received at connection point 19 and supplies appropriate control signals to card 3 through conductor 23. Each of the cards 3 is provided with an input cell E and an output cell S between the cable 4 that supplies a predetermined signal to the card 3 and the output point 10 to the cars 1 to 5. are connected by a commutation cell C. This commutation cell C is opened and closed in response to an M command supplied from the processing card 20 via a corresponding conversion stage R. If desired, the grid configuration card 20 and external circuitry 21 can be made through connections 22 to perform complementary counting operations or to send inhibit signals under certain conditions of use.

FIG. 4 shows a portion of the matrix formed by an assembly of cells E and S connected via a commutation cell C. FIG. Commutation cells C are connected in rows and columns to input cells E and output cells S as shown. As previously mentioned, each commutation card receives 8 separate signals out of 48 signals from input card 1, while a subassembly of 6 commutation cards receives these 8 signals. In the embodiment described here, in which is combined with 20 output cards 5, there are 8 cells E and 20 cells S.
It is individual. The configuration shown in Figure 4 is a part of the entire matrix, and in reality, the entire matrix consists of three
6 times this (6
(corresponding to the input cards 1, 1a, . . . 1n) and three times the number of outputs (assuming 60 users).

The conversion stage R is, in this example, a serial converter of the received signal.
Parallel conversion is performed, and the cells are arranged according to the columns of the matrix portion shown, and are arranged in correspondence with the commutation cells C in one column of each commutation card 3 in each row or the same rack. There is.

Six commutation cards are arranged in parallel and connected to the contact 10 for each selection circuit 14 of the output card 5.
connecting the matrix to 18 (i.e. 6x
This is the same as 3) dividing into individual subassemblies. Only one of the 18 subassemblies is shown in FIG.

Each column of the matrix corresponds to a selected video signal, or some selection, through the card 5 and the circuitry 18 therein to its corresponding three processing cards 20 (one in each rack). , for a user who sends a remote control command that causes the corresponding user to perform the signal reproduction of all the columns in the corresponding matrix. Therefore, this system allows each user to select any of the 48 signals available, and to improve its linearity and frequency without degrading or distorting the selected signal. While maintaining good response characteristics, and in particular, each of the output lines is completely isolated from the lines assigned to other users, eliminating interference between one output line and the other. It is possible to control the clid configuration without causing

5, 6, and 8 each show examples of cells E, C, and S in one embodiment, and FIG. 7 is a diagram for explaining the operation of commutation cell C in FIG. 6. .

In FIG. 5 one of the input cells E is shown, with a coaxial cable 4.4' transmitting one of the signals received from the input card 1 corresponding to one of the commutation cards 3 to the commutation card 3. At the connection point 24 with the card 3, it is connected to an output transistor 26 biased by a small value resistor 25 or 27, which transistors 26 are arranged on one and the same line in the matrix section of FIG. The output signal is supplied in parallel through a conductor 28 to the assembly of the commutation cell C, which is currently being connected, at a low impedance. The conductor 28 corresponds to the strap 12 in FIG.

A signal thus provided to the input of cell C will normally not flow past that cell unless it is provided by at least stage R and is received by or with a commutation instruction specifying that cell. . Cell C shown in FIG. 6 receives signals via Lees 1-28. This signal passes through diode l='29 depending on whether diode 29 is inhibited or uninhibited as a function of the state of diode 30, which is connected by lead 31 to conversion stage R of the remote control signal. or be prevented. When tie auto 29 is conducting, the received signal is transferred to resistor 34.
leads 32 to transistor 33 biased by
supplied through. Transistor 33 then outputs the amplified signal to circuit point 35. This signal is applied to the output cell S (FIG. 8). In cell S, the signal is supplied to transistor 37 via resistor 36. The base of transistor 37 is grounded by lead 38. The output signal at the collector of the transistor 37 is finally sent to the card 5 by a lead 39, which corresponds to the connection point 10 between the output card 5 and the commutation card 3.

FIG. 7 schematically shows the operation of the commutation cell C between the input 28 and the output 35, in which the diodes 29 and 30 and the transistor 33 form part of a synchronously controlled switch; and 33 are controlled so that they close simultaneously when switch 30 is open, and open simultaneously when switch 30 is closed. Regardless of the performance of the elements used, it is conceivable that there will be an interference capacitance in parallel with the elements through which leakage current will flow when switches 29 and 33 are in the open position. If switch 30 were not provided, residual signals would be transmitted to output lead 35, interfering with system operation. On the other hand, if switch 30 is provided, switch 30 is closed when switches 29 and 33 are open, so switch 2
The leakage current through the interference capacitance formed in parallel with 9 is passed to ground and no signal is sent to the output lead 35. Therefore, it is due to the above-described configuration that the circuit of FIG. 6 is able to operate with the advantages obtained with respect to opening and closing of the corresponding commutation cells, ie "all-or-narrasync".

FIG. 9 shows the commutation cells C in the corresponding columns at the row level of the matrix that receive the input signals to be transmitted.
2 shows details of the conversion stage R which receives from the REET 6 through the corresponding output card 5 control instructions for causing any one of the required commutations to take place.

The remote control signal is passed through beam section 19 (FIG. 3) to processing circuit 20, where it is decoded. In the card 20, after selecting the address of the commutation cell C to be switched, the signals are processed by a microprocessor which sends the necessary instructions to the cell C through the lead 23. To do this, each stage R has a shift register 40 to which a clock signal and a load signal are supplied through leads 41 and 42, respectively;
Meanwhile, a serial signal 43 is applied to select the output of the register that corresponds exactly to the address of the cell to be switched. Connection 22 and circuit 21 (FIG. 3) allow other information, for example, counting operation to be performed or prohibited at the same time, allowing commutation only under certain conditions and only for certain users. You can process information in the way you want.

Finally, FIG. 10 shows details of the selection circuit 14 for the same embodiment as previously described. Selection circuit 14
are provided on each output card 5'' to ensure that only the signals received from the matrix through cells E, C and S are sent to the transmission circuit 15 according to the process described above.

In FIG. 10, at the contact point 10 between the commutation card 3 and the output card 5, from the commutation card 3 to the output card 5, i.e., cars 1 to 3.3a, . . .
The output lead 39 of the cell S is shown transferring selected signals from any one of the cards 3n to any one of the cards 5.5a, . . . 5n. The selection circuit 14 has n tie diodes 45.45a, . It is connected to 47. The signal appearing at the output of the circuit is coupled through beam section 48 to the input of transmission circuit 15.

Cell S (FIG. 6) forms in this example a voltage-controlled current generator. By adopting this configuration, it is possible to prevent disturbances due to the resistance at the contact points 10 of the cards 3 and 5 and, in particular, disturbances due to the series resistance provided by the selection circuit 4, thereby preventing the tie It is possible to eliminate the influence of the nonlinear characteristics of

In this respect, if any of the cells C in a column of the matrix are not operating, no current will flow from the corresponding cell S and therefore diode 45 in circuit I4 will be non-conducting. . Due to the current generator constituted by this cell S, the slight voltage difference between cards 5 and 3 will not be added to the normal signal, so that at the level of output cards 1~ There is also no risk of crosstalk occurring between passing signals.

FIG. 11 shows another embodiment of the electronic circuit diagram shown in FIG. 3, showing how signals are transmitted from the input card 1 to the output card 5 and from this output card to the two-wire REIT 6. In FIG. 11, elements having the same functions and effects as the elements shown in FIG. 3 are given the same reference numerals as in FIG.

As shown in detail in FIG. 12, opening and closing operations are performed instead of parallel connected diodes provided in the selection circuit 14 which receives the signal through the lead 44 from the contact point 10 between the commutation card and the output card. or a suitable electronic micro-relay, e.g. an analog commutator type CM, controlled by commands provided by a corresponding conversion stage R.
Switches 49, 49a, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, etc.
・You can use 49n.

However, in this embodiment, the conversion stage R of the control signals causing the commutation of the cell C of the card 3 is provided on the output card 5 and receives instructions directly from the processing card 20 through the lead 32. In this case, a conversion circuit shown in FIG. 13 is used. This conversion circuit also has a shift register 40, which has an input lead 41 for the clock signal and an input lead 42 for supplying the load signal of the register, and a control for selecting the address of the cell C to be switched in the register. The signal is supplied through lead 43. This shift register 40 receives a signal train supplied to the selection circuit 14 as in the previous embodiment, and
A signal train is supplied through a lead 50 to a decoder D carried on a corresponding commutation card 3. Decoder D is schematically illustrated in FIG.
and as many outputs 52 as there are cells C included in the matrix, for causing the transmission of selected signals as a function of instructions received from a given user. The decoder D therefore performs the function of the conversion stage R shown in FIG. 4 at the level of the corresponding part of the matrix.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a portion of the support structure of some of the various cards forming part of a crid arrangement according to the invention; FIG. A schematic perspective view of the support structure showing the parallel connection of several separate racks in the support structure; FIG. FIG. 4 is a schematic diagram showing a part of the matrix provided in the commutation grid configuration of the present invention; FIG. 5 is a system circuit diagram illustrating the electronic operation of the configuration; FIG. , the electronic circuit diagram of the input cell of the matrix shown in FIG. 4, and FIG.
FIG. 7 is a simplified circuit diagram for explaining the operation of the commutation cell in FIG. 6;
8 is an electronic circuit diagram of the output cell in the matrix shown in FIG. 4, FIG. 9 is a circuit diagram of the control signal conversion stage of the commutation cell, and FIG. 10 is an input selection circuit of the output card. FIG. 11 is an electronic circuit diagram of another embodiment of the commutation grid configuration with some changes to the grid configuration of FIG. 3. FIG. 12 is an output card selection circuit. FIG. 13 is a circuit diagram of a modification of the conversion stage modified for the embodiment shown in FIG. 11; FIG. 14 is a circuit diagram of a decoder used in the embodiment of FIG. 11; FIG. 2 is a schematic circuit diagram of the circuit. ■...Input card, 2...Rack, 3...
Commutation card, 5...Output card, 10
... Mutual contact point between the edges of the commutation card and output card, 14... Selection circuit, E... Input cell, C... Commutation cell, S... Output Cell, R...conversion stage. Patent Applicant Bijikatsuru Prue Agent Satoshi Shimizu 2 Idiots F''I6.riL--,,----,'' Fsc,, 10 ftc-, 12 r16.6 FIc,, 7

Claims (15)

[Claims] (1) By optionally distributing a selected signal, particularly a video signal, from among N signals applied to N inputs to M outputs, M as a function of an appropriate remote control signal. A commutation grid configuration for signal distribution in which each of the outputs can be switched at will to one of the N inputs, each of which has a total number N of signals to be transmitted.
a fixed support for an assembly of input cards receiving a number of signals, in particular video signals or video and/or audio signals, corresponding to a predetermined divisor of; at least one of the commutation cards each connected to the input card; at least one subassembly of output cards connected to said commutation card, each of which transmits to the user any selected signal among the signals received by each commutation card from a corresponding input card; a subassembly, the commutation card comprises an assembly of input cells arranged in parallel with each other in a number equal to said divisor of the number of video signals to be transmitted received by one input card, and an output an assembly of output cells equal to the number of cards, each of the input cells being coupled to each of the output cells by a commutation cell which transmits selected signals according to instructions given by the user. operative to pass from input to output, said instructions being provided through an output card corresponding to that user via a processing card common to the assembly of commutation cards and controlling a translation stage for instructions from the user; The support has at least one rack containing a subassembly of commutation cards arranged in parallel and a subassembly of output cards arranged parallel to each other but perpendicular to the commutation cards. a subassembly, the point of contact between the edge of each commutation card and the corresponding edge of the corresponding output card is such that the contact point between the edge of each commutation card and the corresponding edge of the corresponding output card connects the output cell on the commutation card with the selection card provided on the corresponding output card. A commutation grid configuration for signal distribution configured to provide connectivity. (2) A commutation grid configuration for signal distribution according to claim 1, wherein the processing card is parallel to the commutation card and in contact with the output card. composition. (3) A commutation grid arrangement according to claim 2, wherein the output of the selection circuit is a two-wire lead for transmitting audio and/or video signals to a suitable receiver at a remote location. A commutation grid arrangement for signal distribution, characterized in that it is connected to a transmission circuit for reproducing said audio and/or video signal before sending it to said signal. (4) A processing circuit having a commutation grid configuration according to claim 3, wherein the two-wire lead is arranged separately from the commutation card in the same rack as the commutation card. A commutation for signal distribution, characterized in that it is adapted to transmit in the opposite direction of said signals a remote control command received by a processing circuit provided on a corresponding output card which supplies control pulses to the input of said signal. Grid configuration. (5) A commutation grid arrangement according to one of claims 1 to 4, wherein each commutation card in the subassembly is connected to the input card by a matched coaxial cable. Each lead of this coaxial cable transmits the signal received by the input card to each of the commutation cards in the corresponding subassembly, and the matching coaxial cable connects the input card and the termination resistor at each end. A commutation grid configuration for signal distribution, characterized in that it is given by: (6) A commutation grid configuration according to claim 2, wherein the support structure includes a plurality of racks, and the coaxial cable is connected in series from one rack to the next. Features a commutation grid configuration for signal distribution. (7) A commutation grid arrangement according to one of claims 1 to 6, in which a processing card for remote control instructions is connected to a shift register that supplies control signals to the corresponding cells. A commutation grid configuration for signal distribution, comprising a microprocessor device for transmitting information. (8) A commutation grid configuration according to one of claims 1 to 7, wherein each commutation card includes first and second electronic switches connected in series with each other; a third switch that grounds the interconnection point of these two electronic switches; when the third switch is closed, the first and second electronic switches open; when it is open,
A commutation grid configuration for signal distribution, characterized in that the first and second electronic switches are closed. (9) A commutation grid configuration according to claim 8, wherein the first and second electronic switches are suitably biased diodes and the third switch is a transistor. Features a commutation grid configuration for signal distribution. (10) The commutation grid configuration according to claim 9, wherein the diode constituting the first switch is connected to the third switch by a lead connected to the diode constituting the second switch. A commutation grid configuration for signal distribution, characterized in that the commutation grid is connected in series to the collector of a transistor constituting a switch, and the output of a control command conversion stage is supplied to the diode. (11) The commutation grid configuration according to any one of claims 1 to 10, wherein each output cell on the commutation card has a base grounded,
A commutation grid configuration for signal distribution, characterized in that it constitutes a voltage-controlled current generator including a transistor whose emitter receives a signal transmitted by the commutation card and whose collector generates an output signal. (12) A commutation grid configuration according to one of claims 1 to 11, wherein the input cells and the output cells form a matrix consisting of rows and columns, and the intersections of the rows and columns a commutation cell in each column, the conversion stage controlling the switching of the commutation cells in the column for the transmission of the signal from one input cell to the output cell. grid configuration. (13) A commutation grid configuration according to claim 12, wherein each input cell is a high impedance cell receiving a signal transmitted by a coaxial cable from a corresponding input card, and the cell A commutation grid configuration for signal distribution is characterized in that signals are supplied in parallel at low impedance to the commutation cells in one row of the matrix. (14) A commutation grid arrangement according to claim 1, wherein the conversion stage is provided on a corresponding output card and receives a remote control signal directly from the processing card; A commutation grid configuration for signal distribution, characterized in that a signal is sent back to a corresponding commutation cell through a decoder circuit. (15) The commutation grid configuration according to claim 1, characterized in that the elements provided on each commutation card are arranged in an area on an extension line of the corresponding output card. commutation grid configuration for signal distribution.